Fear of premature burial was widespread in 18th and 19th century Europe, leading to the invention of the safety coffin. Over thirty different designs were patented in Germany in the second half of the 19th century.
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Safety coffins were popular in the 18th and 19th centuries due to a widespread fear of being buried alive.
Most designs of safety coffins utilize traditional signaling methods, but I found a Google Patent for a digital safety coffin.
There are numerous designs for safety coffins.